Utilization of a Green Brominating Agent for the Spectrophotometric Determination of Pipazethate HCl in Pure Form and Pharmaceutical Preparations

Figure 3

Absorption spectra of the oxidation product against water in the presence of different concentrations of PZT: 1.6 mL of KBrO₃ (100 μg mL⁻¹); 1.0 mL of 2.0 mol L⁻¹ HCl; 1.4 mL of 5 × 10⁻³ mol L⁻¹ FAS; 2.0 mL of 1.0 mol L⁻¹ SCN⁻; PZT (a) 3.5 μg mL⁻¹; (b) 3.0 μg mL⁻¹; (c) 2.0 μg mL⁻¹; (d) 1.5 μg mL⁻¹; (e) 1.0 μg mL⁻¹, and (f) 0.5 μg mL⁻¹.